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Old Testament Hebrew Lexical Dictionary
Strong's #5427 - נֶתֶר
1) natron, nitre, soda, carbonate of soda
Jeff Benner, Ancient Hebrew Research Center Used by permission of the author.
נֶתֶר m. nitre (Gr. νίτρον, λίτρον), prop. natron of the moderns, fossil alkali, potash (different from בֹּרִית vegetable alkali), which, when mixed with oil, is used even now for soap, Proverbs 25:20; Jeremiah 2:22. It appears to be so called because, when water is poured upon it, it effervesces or ferments. See Beckmann, Beyträge zur Geschichte der Erfindungen, t. iv. p. 15, seq. Also the same writer’s Comment. ad Aristot. de Mirab. Auscultat. c. 54. J. D. Michaëlis, de Nitre, § 10.
the Third Week after Epiphany